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Yamamoto Chemicals, Inc.

USPTO Granted Patents = 72

EPO Patents = 6

Forward Citations = 414

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87 inventors (with patents filed for the assignee):

Takahisa Oguchi (21 out of 24 patents)

Hisato Itoh (19 out of 49 patents)

Shigeo Fujita (15 out of 30 patents)

4. Kenichi Sugimoto (13 out of 72 patents)

5. Yojiro Kumagae (12 out of 16 patents)

6. Mansuke Matsumoto (11 out of 11 patents)

7. Nobuaki Sasaki (10 out of 10 patents)

8. Katashi Enomoto (10 out of 19 patents)

9. Sumio Hirose (9 out of 23 patents)

10. Shin Aihara (9 out of 14 patents)

11. Keisuke Takuma (8 out of 49 patents)

12. Sayuri Wada (8 out of 8 patents)

13. Toshihiro Masaoka (7 out of 8 patents)

14. Hideki Umehara (7 out of 14 patents)

15. Keiki Chichiishi (6 out of 6 patents)

Core Competencies:

Benzotriazole Compound

Ink Composition

Naphthalocyanine Compound

Phthalocyanine Compounds

Optical Material

Organic Transistor

Polymethine Compounds

Photothermal Conversion Material

Optical Recording Medium

Near Infrared Absorbers

Heat-Sensitive Recording Material

Dipyrromethene Metal Chelate

72 patents: Sort by Forward Citations

1. 12486239 - Benzotriazole compound, light absorber, and resin composition (2025-12-02),

2. 11326066 - Ink composition for PTP package, and ink (2022-05-10),

3. 11174274 - Naphthalocyanine compound, method for producing same, and use thereof (2021-11-16),

4. 11015061 - Phthalocyanine-based compound and uses of same (2021-05-25),

5. 10640456 - Compound and intermediate thereof (2020-05-05),

6. 10627650 - Optical material and use thereof (2020-04-21),

7. 9857503 - Optical material and use thereof (2018-01-02),

8. 9708244 - Coloring material and method for producing the same (2017-07-18),

9. 9266905 - Color material and method for producing the same (2016-02-23),

10. 8888906 - Heat-sensitive color-developing composition and heat-sensitive recording material comprising the composition (2014-11-18),

11. 8294144 - Organic transistor (2012-10-23),

12. 8012608 - Polymer containing sulfo group and organic electroluminescent element containing the polymer (2011-09-06),

13. 7709660 - Polymethine ether compounds (2010-05-04),

14. 7485404 - Nonsolvate-form crystal of polymethine compound and process for producing the same (2009-02-03),

15. 7446212 - Polymethine ethers (2008-11-04),

Yamamoto Chemicals, Inc. is a global chemical manufacturing company with a strong focus on innovation and sustainability. With several decades of industry experience, we specialize in the development and production of high-quality chemicals for various sectors including automotive, electronics, cosmetics, and more. Our commitment to research and development enables us to deliver cutting-edge solutions that meet our customers' evolving needs. Visit our website to learn more about our comprehensive product portfolio and find out how we can support your business.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

72 Patents

#2 in Yao

#1,357 in Japan

#10,081 in the World

Yamamoto Chemicals, Inc.

Forward Citations = 414

87 inventors:

Takahisa Oguchi (21 out of 24 patents)

Hisato Itoh (19 out of 49 patents)

Shigeo Fujita (15 out of 30 patents)

4. Kenichi Sugimoto (13 out of 72 patents)

5. Yojiro Kumagae (12 out of 16 patents)

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